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  • Journal article
    Hampshire A, Owen AM, 2006,

    Fractionating attentional control using event-related fMRI

    , Cereb Cortex, Vol: 16, Pages: 1679-1689, ISSN: 1047-3211

    Despite numerous functional neuroimaging and lesion studies of human executive function, the precise neuroanatomical correlates of specific components of attentional control remain controversial. Using a novel approach that focused upon volunteer behavior rather than experimental manipulations, specific components of attentional shifting were fractionated, and their neural correlates differentiated using event-related fMRI. The results demonstrate that the ventrolateral prefrontal cortex is involved in switching attention "between" stimulus dimensions, whereas the posterior parietal cortex mediates changes in stimulus-response mapping. Furthermore, reversals based on negative feedback activated the lateral orbitofrontal cortex, whereas positive feedback modulated activity in the medial orbital frontal cortex. Finally, the dorsolateral prefrontal cortex was active throughout solution search. These findings support the hypothesis that lateral prefrontal, orbital, and parietal areas form a supervisory network that controls the focus of attention and suggests that these regions can be fractionated in terms of their specific contributions.

  • Journal article
    Sharp DJ, Scott SK, Cutler A, Wise RJSet al., 2005,

    Lexical retrieval constrained by sound structure: The role of the left inferior frontal gyrus

    , BRAIN AND LANGUAGE, Vol: 92, Pages: 309-319, ISSN: 0093-934X
  • Journal article
    Sharp DJ, Scott SK, Wise RJS, 2004,

    Retrieving meaning after temporal lobe infarction: The role of the basal language area

    , ANNALS OF NEUROLOGY, Vol: 56, Pages: 836-846, ISSN: 0364-5134
  • Conference paper
    Sharp DJ, Scott SK, Crinion J, Wise RJSet al., 2004,

    Recovery from aphasia: The role of the basal language area

    , Spring Meeting of the Association-of-British-Neurologists, Publisher: B M J PUBLISHING GROUP, Pages: 1217-1218, ISSN: 0022-3050
  • Conference paper
    Sharp DJ, Scott SK, Wise RJS, 2004,

    Retrieving meaning after temporal lobe infarction

    , Autumn Meeting of the Association-of-British-Neurologists, Publisher: B M J PUBLISHING GROUP, Pages: 798-798, ISSN: 0022-3050
  • Journal article
    Sharp DJ, Scott SK, Wise RJS, 2004,

    Monitoring and the controlled processing of meaning: Distinct prefrontal systems

    , CEREBRAL CORTEX, Vol: 14, Pages: 1-10, ISSN: 1047-3211
  • Journal article
    Ginsberg L, Malik O, Kenton AR, Sharp D, Muddle JR, Davis MB, Winer JB, Orrell RW, King RHMet al., 2004,

    Coexistent hereditary and inflammatory neuropathy.

    , Brain, Vol: 127, Pages: 193-202, ISSN: 0006-8950

    Classically, the course of Charcot-Marie-Tooth (CMT) disease is gradually progressive. We describe eight atypical patients who developed acute or subacute deterioration. Seven of these had genetically proven CMT disease type 1A (CMT1A) due to chromosome 17p11.2-12 duplication, and one had X-linked disease (CMTX) due to a mutation in the GJB1 gene. In this group there was sufficient clinical, electrophysiological and neuropathological information to indicate a diagnosis of a superimposed inflammatory polyneuropathy. The age range of the patients was 18-69 years, with a mean of 39 years. A family history of a similar neuropathic condition was present in only four patients. All eight had an acute or subacute deterioration following a long asymptomatic or stable period. Seven had neuropathic pain or prominent positive sensory symptoms. Nerve biopsy demonstrated excess lymphocytic infiltration in all eight patients. Five patients were treated with steroids and/or intravenous immunoglobulin, with variable positive response; three patients received no immunomodulatory treatment. Inflammatory neuropathy has previously been recognized in patients with hereditary neuropathy, with uncharacterized genetic defects and with CMT1B. We present detailed assessments of patients with CMT1A and CMTX, including nerve biopsy, and conclude that coexistent inflammatory neuropathy is not genotype-specific in hereditary motor and sensory neuropathy. Although this was not a formal epidemiological study, estimates of the prevalence of CMT disease and chronic inflammatory demyelinating polyneuropathy indicate that the association is more frequent than would be expected by chance. This has implications for understanding the pathogenesis of inflammatory neuropathies and raises important considerations in the management of patients with hereditary neuropathies. If a patient with CMT disease experiences an acute or subacute deterioration in clinical condition, treatment of a coexistent inflammatory

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